US4899434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a thin film magnetic head with a leveler layer and superstrate
Assignee: Certance LLC
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Filing: 1989-07-24
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Granted: 1990-02-13
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Expires: 2009-07-24
Abstract
Abstract A thin film magnetic head having a substrate, a magnetic head and a superstrate formed of materials which are highly resistive to being abraded by a magnetic media being moved thereacross is shown. The magnetic head includes a bottom pole piece having a front gap section and a rearwardly extending portion positioned at predetermined locations on the substrate. The bottom pole piece forms a bottom support for a coil having a plurality of coil windings. An insulating structure having a thin gap defining section and a thick coil windings enclosing portion is located on the bottom pole piece such that the thin gap defining portion establishes the thickness of a magnetic transducing gap and the thick coil windings enclosing portion encloses and surrounds that portion of the coil windings supported by the bottom pole piece. A magnetic top pole piece layer having a front gap portion, a contoured outer surface having a step formed therein, and a rear magnetic closure portion is positioned with the front gap section thereof on the thin gap defining portion of the insulating structure located on the front gap section of the bottom pole piece. The top pole piece extends from the transducing gap rearward to a rear magnetic closure section to enclose that portion of the coil windings located between the top pole piece and the bottom pole piece. A leveler layer is positioned on top of the top pole piece to support a superstrate.
Inventors
- 👤 Gary E. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:06
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3163; G11B5/3103; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49043; Y10T29/49044; Y10T29/4906; Y10T29/49064
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
338 words
The method of forming a leveler layer on a thin film magnetic transducer having a bottom pole piece formed on a substrate, a top pole piece having a front gap section which cooperates with the bottom pole piece to form a front magnetic transducing gap, a contoured outer surface having a step formed thereon, a rear magnetic closure portion which cooperates with the bottom pole piece to form a rear magnetic closure section and a rearward support section, and coil windings enclosed by an insulating structure, a portion of which are locted between the bottom pole piece and the top pole piece and a portion of which extend rearwardly on the rearwardly extending section of the bottom pole piece beyond the rear magnetic closure section and wherein the rearward support section is located on that portion of the insulating structure enclosing the coil winding which extends rearwardly on the bottom pole piece which extends rearwardly beyond the rear magnetic closure section comprising the steps of forming a leveler pattern mask on the top pole piece and insulating structure containing the coil windings with unmasked sections thereof located on the front gap section of the top pole piece and on the support section to produce an unmasked front gap section and an unmasked support section with the remaining portion of the top pole piece and insulating structure being masked by the leveler pattern mask; depositing a leveler layer of a thickness which exceeds the height of the step of the contoured outer surface onto the unmasked front gap section of the top pole piece and the unmasked support section forming a leveler layer having a forward leveler section on the front gap section of the top pole piece and a rearward leveler section on the support section; and removing the remainder of the leveler pattern mask leaving a space located remotely from and rearward of the magnetic transducing gap and between the forward leveler section, the rearward leveler section and the contoured outer surface of the top pole piece.
Claim 2
Independent Claim
338 words
The method of forming a leveler layer on a thin film magnetic transducer having a bottom pole piece formed on a substrate, a top pole piece having a front gap section which cooperates with the bottom pole piece to form a front magnetic transducing gap, a contoured outer surface having a step formed thereon, a rear magnetic closure portion which cooperates with the bottom pole piece to form a rear magnetic closure section and a rearward support section, and coil windings enclosed by an insulating structure, a portion of which are locted between the bottom pole piece and the top pole piece and a portion of which extend rearwardly on the rearwardly extending section of the bottom pole piece beyond the rear magnetic closure section and wherein the rearward support section is located on that portion of the insulating structure enclosing the coil winding which extends rearwardly on the bottom pole piece which extends rearwardly beyond the rear magnetic closure section comprising the steps of forming a leveler pattern mask on the top pole piece and insulating structure containing the coil windings with unmasked sections thereof located on the front gap section of the top pole piece and on the support section to produce an unmasked front gap section and an unmasked support section with the remaining portion of the top pole piece and insulating structure being masked by the leveler pattern mask; depositing a leveler layer of a thickness which exceeds the height of the step of the contoured outer surface onto the unmasked front gap section of the top pole piece and the unmasked support section forming a leveler layer having a forward leveler section on the front gap section of the top pole piece and a rearward leveler section on the support section; and removing the remainder of the leveler pattern mask leaving a space located remotely from and rearward of the magnetic transducing gap and between the forward leveler section, the rearward leveler section and the contoured outer surface of the top pole piece.
Claim 3
Dependent Claim
133 words
The method of claim 1 further comprising the steps of filling the space located remotely from and rearward of the magnetic transducing gap and between the forward leveler section, rearward leveler section, and the contoured outer surface of the top pole piece with an adhesive which does not affect the operating characteristics of the magnetic head; applying an adhesive, which does not affect the operating characteristics of the magnetic head, onto the exposed top outer surfaces of each of the forward leveler section and rearward leveler section; and applying a superstrate having a relatively planar support surface onto the forward leveler section and rearward leveler section with the support surface thereof engaging the adhesive located on the exposed, top outer surface of each of the forward leveler section and the rearward leveler section.
Claim 4
Dependent Claim
57 words
The method of claim 1 wherein the step of forming a leveler pattern mask on the top of the pole piece further comprises the step of photoresisting, exposing and developing a resist material to form a leveler pattern with the front gap section and support section of the pole piece being unmasked to receive the leveler layer.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein the step of depositing a leveler layer comprises the step of electroplating the leveler layer with NiFe using an appropriate nickel-iron solution.
Claim 6
Dependent Claim
25 words
The method of claim 1 wherein the step of removing the remainder of the leveler pattern mask comprises the step of stripping the resist material.
Claim 7
Dependent Claim
36 words
The method of claim 5 wherein a plating base layer is deposited onto the thin film tranducer prior to forming the top pole piece layer and further comprising the step ion milling the plating base layer.
Claim 8
Dependent Claim
19 words
The method of claim 6 further comprising the step probe testing the electrical resistance of the thin film transducer.
Claim 9
Dependent Claim
56 words
The method of claim 1 further comprising the step of filling the space located remotely from and rearward of the magnetic transducing gap and between the forward leveler section, rearward leveler section, and the contoured outer surface of the top pole piece with an adhesive which does not affect the operating characteristics of the magnetic head.
Claim 10
Dependent Claim
41 words
The method of claim 8 further comprising the step of applying an adhesive, which does not affect the operating characteristics of the magnetic head, onto the exposed top outer surfaces of each of the forward leveler section and rearward leveler section.
Claim 11
Dependent Claim
54 words
The method of claim 9 further comprising the step of applying a superstrate having a relatively planar support surface onto the front leveler section and rearward leveler section with the support surface thereof engaging the adhesive located on the exposed, top outer surface of each of the forward leveler section and rearward leveler section.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |